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Viral diseases; Apple chlorotic leafspot genus Trichovirus, Apple chlorotic leafspot virus (ACLSV) Apple dwarf (Malus platycarpa)
Gymnosporangium juniperi-virginianae is a plant pathogen that causes cedar-apple rust. [1] In virtually any location where apples or crabapples and eastern red cedar (Juniperus virginiana) coexist, cedar apple rust can be a destructive or disfiguring disease on both the apples and cedars.
The decline of apple and pear trees from their landscape can be expensive to replace and could have a negative effect on tourism. In the long-run, fire blight is a very important factor of economy and society. [citation needed] A relatively small number of apple cultivars are responsible for an enormous proportion of yearly apple production.
Apple rubbery wood virus, also known as apple rubodvirus is a viral disease that causes apple rubbery wood in apple and pear cultivars. There are two varieties: ARWV 1 and ARWV 2. It gets its name from its distinctive effect that it has on its host trees, which show unusual flexibility in the stems and branches after a few years of infection.
Planting of less susceptible apple cultivars, horticultural practices that promote tree health and reduce fruit wetness hours, removal of overwintering diseased twigs and fruit, and fungicides Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum ...
Apple scab is a common disease of plants in the rose family that is caused by the ascomycete fungus Venturia inaequalis. [1] While this disease affects several plant genera, including Sorbus, Cotoneaster, and Pyrus, it is most commonly associated with the infection of Malus trees, including species of flowering crabapple, as well as cultivated apple.
Bitter pit in the 'Summerred' cultivar Signs of bitter pit beginning on one apple, lower left. Bitter pit is a disorder in apple fruits, now believed to be induced by calcium deficiency. It occurs less commonly in pears. The disease was probably first reported in Germany where it was known as Stippen. [1]
A study by Hunter et al. 1959 was conducted, where buds from virus infected trees were grafted onto healthy trees. The healthy trees with the buds were then incubated at 37 °C for 28, 30, 36 and 40 days. A year following the incubation, there were no symptoms present on the healthy tree other than from the buds. [10]
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